I think Amad is clearly better than Antony already. Sancho has his own issues that have nothing to do with pure ability, but in a market where left footed RW's are so difficult to find we'd be stupid to loan one of our brightest prospects out when the other two options are lackluster at best.I liked some of his work rate and some of his bursts of speed. We know he has the technique, and I think he can be somewhere similar to Antony and Sancho. All 3 of them are young and not an issue at all if we keep him as part of that rotation. But I don't think any of the 3 have the potential that Garnacho has or don't think they can reach Rashfords level. Which isn't a problem, but just generally speaking. On one hand think it'd be better for amad to get a PL loan so he plays regularly, on the other hand he can be a good squad player and good Antony competition right away.
The main difference between those three and Garnacho though is the obvious take on ability/burst that the latter has. It's already an elite skill that translates in matches, so you can easily project the player he could be come if he refines his technique/decision making/final 3rd product.